Well, next week is a go for pier.
Concreter can't say which day when exactly, but job will be finished by Thursday 26th (Friday is AFL holiday in VIC).
On coming weekend I will try to cut the square hole in existing concrete slab (using angle grinder, diamond disk and plenty of water), the cut off may then be used as a base for pier at the bottom of the pit.. all depends on concreter.
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